i have a check engine light on my car, plugged it in it said cylinder miss fire 1-6. obv its not the case becasue my car wouldnt run at all. if all cylinders were misfiring. i was told the coil packs for each plug may be going bad
? at first i thought i had a clogged cat because of the huge decrease in power i had. over time the check engine finally came on, telling me about the misfire. its weird, sometimes the car cars strong, sometimes very poor. i can tell right off the bat how the car will run just by going to start it. if its a strong start( rmps jump fast) the car runs well. If the car Laggs and slowly increases in RPM the car runs like crap. also noticed at idle( not all the time) the cars idle sputters( almost the sound of cams). Anyone have any idea what the hell is going on. All that is done to my car is a cat back greddy evo 2 exhaust

 

^you need to determine if its the coil packs or if it really is misfiring.